title: Multiphoton near-infrared quantum cutting luminescence phenomena of Tm3+ ion in (Y1-xTm(x))3Al5O12 powder phosphor.
abstract: In the present study, the multiphoton near-infrared downconversion quantum cutting luminescence phenomena of Tm3+ ion in (Y(1-x)Tm(x))(3)Al(5)O(12) powder phosphor, which is currently a hot research topic throughout the world, is reported. The x-ray diffraction spectra, the visible to near-infrared excitation and emission spectra, and fluorescence lifetimes are measured. It is found that Tm:YAG powder phosphor has intense two-photon quantum cutting luminescence, and, for the first time, it is found that Tm:YAG powder phosphor has strong four-photon near-infrared quantum cutting luminescence of 1788 nm (3)F4 → (3)H6 fluorescence of Tm(3+) ion. It is also found that the theoretical up-limit of four-photon near-infrared quantum cutting efficiency is about 282.12%, which results from both the {(1)D2 → (3)F2, (3)H6 → (3)H4} and {(3)H4 → (3)F4, (3)H6 → (3)F4} cross-energy transfers.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Chen
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Salamo
authors.forename: Guojian
authors.initials: G
authors.lastname: Yang
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Li
authors.forename: Xianlin
authors.initials: X
authors.lastname: Ding
authors.forename: Yan
authors.initials: Y
authors.lastname: Gao
authors.forename: Quanlin
authors.initials: Q
authors.lastname: Liu
authors.forename: Jinghua
authors.initials: J
authors.lastname: Guo
mesh_terms: D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D036641:Microscopy, Fluorescence, Multiphoton / Q000379:methods*; D011208:Powders; D011789:Quantum Theory; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013932:Thulium / Q000737:chemistry*
chemical_list: D011208:Powders; D013932:Thulium